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Numerical investigation of folding of coated papers
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6232-8819
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-8699-7910
2005 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 67, no 4, 383-394 p.Article in journal (Refereed) Published
Abstract [en]

Folding of coated paper is examined numerically using the finite element method. Particular emphasis is put on the behaviour of field variables relevant for cracking of the coating layers. In the numerical analysis, the basepaper is modelled as an anisotropic elastic-plastic material (both elastic and plastic anisotropy is accounted for) while the constitutive behaviour of the coating layers are approximated by classical (Mises) elastoplasticity. The numerical results suggest, among other things, that particular forms of plastic anisotropy can substantially reduce the maximum strain levels in the coating. It is also shown that delamination buckling, in the present circumstances, will have a very small influence on the strain levels in the coating layer subjected to high tensile loading.

Place, publisher, year, edition, pages
2005. Vol. 67, no 4, 383-394 p.
Keyword [en]
Coated paper (A), Finite element analysis (FEA) (C), Layered structures (A), Mechanical properties (B), Plastic deformation (B)
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5325DOI: 10.1016/j.compstruct.2004.01.024ISI: 000227052800002Scopus ID: 2-s2.0-10644264191OAI: oai:DiVA.org:kth-5325DiVA: diva2:8515
Available from: 2004-10-01 Created: 2004-10-01 Last updated: 2017-12-04Bibliographically approved
In thesis
1. On folding of coated papers
Open this publication in new window or tab >>On folding of coated papers
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The mechanical behaviour of coated papers during folding has been investigated. This problem has been studied with experimental techniques and numerical analyses in order to give a better understanding of the folding properties of coated papers pertinent to the mechanical behaviour in general, and particularly cracking along the fold.

A microscopy investigation has been performed. The surface of the folded paper has been carefully examined to study the event of fracture and related issues. The influence of the grammage on the cracking event has been studied and it was shown that the coating material would not fail if the paper sample was sufficiently thin. It was found that a stress or strain based criterion is sufficient to describe the cracking of the coating layers and that the anisotropy of paper should be taken into account when studying the folding process.

The finite element method has been used for the numerical analyses remembering that the geometry of the problem is rather complicated, excluding a solution in analytical form. Using different constitutive models for the base stock, it has been shown that the deformation of the coated paper during folding is much governed by the paper substrate. The numerical results also suggested that particular forms of plastic anisotropy can substantially reduce the maximum strain levels in the coating. Furthermore, it has also been shown that delamination buckling, in the present circumstances, has a very small influence on the strain levels in the coating layer subjected to high tensile loading.

Dynamic effects have also been studied and it has been shown that a quasi-static analysis of the problem is sufficient in order to describe many of the important features related to cracking. An attempt to model strong anisotropy of paper has been presented and the results indicate that the large anisotropy in the thickness direction of coated papers needs to be taken into account in order to fully understand the mechanics of folding.

Finally, an experimental investigation has been presented in order to study if important mechanical properties of the coating material could be determined by microindentation techniques. The results presented indicate that microindentation can be a powerful tool for characterization of these materials, but only if careful efforts are made in order to account for the influence from plasticity as well as from boundary effects.

KEYWORDS: folding, coated papers, finite element method, cracking, indentation, anisotropy, plasticity.

Place, publisher, year, edition, pages
Stockholm: Hållfasthetslära, 2004
Series
Trita-HFL, ISSN 1104-6813 ; 0307
Keyword
Materials science, folding, coated papers, finite element method, cracking, indentation, Materialvetenskap
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-28 (URN)
Public defence
2004-10-01, STFI-salen, STIFI, Drottning Kristina väg 61, Stockholm, 10:00
Opponent
Supervisors
Available from: 2004-10-01 Created: 2004-10-01 Last updated: 2012-03-19Bibliographically approved

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Larsson, Per-LennartÖstlund, Sören

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